Measurement Techniques. DC Circuits Feb. 2009. Measurement Techniques DC Circuits . Resistance (R) Ohms, Ω , K Ω , M Ω Voltage (V) Volt, AC, DC, mV, KV Current (I) Amp, mA (milliamps), uA (microamps). Series Circuit RT = R1 + R2 + R3. R T Ω. R T. R1 R2 R3.
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RT = R1 + R2 + R3
R3Bread Board Techniques - Series Circuits Resistance Measurement
Given R1= 100, R2= 4.7K, R3=100K Find RT
Vs = VR1 + VR2 + VR3Breadboard Techniques - Series Circuit Voltage Measurement
IT = IR1 = IR2 = IR3
ITBread Board Techniques - Series Circuit Current Measurement
R1 R2 R3Bread Board Techniques – Parallel CircuitsResistance
100 ΩCalculating Total Current (IT)
2. Then use Ohm’s Law to find total current
Using Product-Over-Sum Method
R1//R2 = (150 x 300) / (150 + 300) = 100 ohms
Rp//R3 = (100 x 100) / (100 + 100) = 50 ohms
Note: when the parallel resistors are equal in value, just divide by the number of R’s
3K//3K = 1.5K
6K//6K//6K = 2K
Using Reciprocal Method
1/RT = 1/R1 + 1/R2 + 1/R3 = 1/150 + 1/300 + 1/100
= 0.00666 + 0.00333 + 0.01 = 0.020
RT = 1/ 0.020 = 50 ohms
RT = 50 ohms IT = 1 amp
I1 = Vs / R1 = 50/150 = 0.333333 amps
I2 = Vs / R2 = 50/300 = 0.166666 amps
I3 = Vs / R3 = 50/100 = 0.200000 amps
VOUT = 0 volts
A balanced bridge can be used to measure an unknown resistance.
The Wheatstone bridge can be used as an “ohmmeter” by comparing the unknown resistance value to a known one.
RsConditioning circuit for resistive sensors and transducers
The bridge is often used as a conditioning circuit to convert the output of aresistivetype sensing element into a voltage (mV)